sysdeps/unix/sysv/linux/generic/wordsize-32/fcntl.c

   1 /* Copyright (C) 2011-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <assert.h>
  20 #include <errno.h>
  21 #include <sysdep-cancel.h>      /* Must come before <fcntl.h>.  */
  22 #include <fcntl.h>
  23 #include <stdarg.h>
  24
  25 #include <sys/syscall.h>
  26
  27
  28 static int
  29 do_fcntl (int fd, int cmd, void *arg)
  30 {
  31   if (cmd != F_GETOWN)
  32     return INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg);
  33
  34   INTERNAL_SYSCALL_DECL (err);
  35   struct f_owner_ex fex;
  36   int res = INTERNAL_SYSCALL (fcntl64, err, 3, fd, F_GETOWN_EX, &fex);
  37   if (!INTERNAL_SYSCALL_ERROR_P (res, err))
  38     return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
  39
  40   __set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
  41   return -1;
  42 }
  43
  44
  45 #ifndef NO_CANCELLATION
  46 int
  47 __fcntl_nocancel (int fd, int cmd, ...)
  48 {
  49   va_list ap;
  50   void *arg;
  51
  52   va_start (ap, cmd);
  53   arg = va_arg (ap, void *);
  54   va_end (ap);
  55
  56   return do_fcntl (fd, cmd, arg);
  57 }
  58 #endif
  59
  60
  61 int
  62 __libc_fcntl (int fd, int cmd, ...)
  63 {
  64   va_list ap;
  65   void *arg;
  66
  67   va_start (ap, cmd);
  68   arg = va_arg (ap, void *);
  69   va_end (ap);
  70
  71   if (SINGLE_THREAD_P || cmd != F_SETLKW)
  72     return do_fcntl (fd, cmd, arg);
  73
  74   int oldtype = LIBC_CANCEL_ASYNC ();
  75
  76   int result = do_fcntl (fd, cmd, arg);
  77
  78   LIBC_CANCEL_RESET (oldtype);
  79
  80   return result;
  81 }
  82 libc_hidden_def (__libc_fcntl)
  83
  84 weak_alias (__libc_fcntl, __fcntl)
  85 libc_hidden_weak (__fcntl)
  86 weak_alias (__libc_fcntl, fcntl)